Hybrid Steel Timber Brace Connection

ABSTRACT

Two innovative hybrid steel-wood seismic force-resisting systems have been developed that utilize the energy dissipation capabilities of advanced structural steel systems to improve the seismic performance and design of heavy timber structures. Conceptual designs of these two systems are presented: first, a buckling restrained braced frame adapted for wood buildings using glued-in rods; and second,a ductile and replaceable steel reduced beam section connection adapted for wood buildings using a steel panel zone and self-tapping screws.To investigate the dynamic behavior of these systems nonlinear time-history analyses was performed on four six-storey structures designed for Victoria BC: two using the new hybrid steel-wood designs and two using conventional steel-only designs.These analyses were conducted using OpenSees. Each structure is subjected to 44 maimum considered and 44 design basis earthquakes using FEMA-P695 ground motions.Comparable seismic performance was observed for the hybrid and steel-only frames.Weight reduction due to the use of wood resulted in significantly lower base shears for the hybrid structure.Average interstorey drifts remained within allowable limits of 2.5% of storey heightas specified in the NBCC(2010)for both the buckling-restrained braced and moment-resisting frames. Storey accelerations were similar for both the hybrid and steel-only frames.

Introduction
The high strength-to-weight ratio of wood allows wood structures to be potentially lighter than equivalent concrete or steel structures.This low weight makes wood buildings attractive for use in seismically active regions; however, existing lateral force resisting systems for heavy timber buildings typically have significantly less ductility than seismically-designed steel or concrete buildings.This results in lower force modification factors(R-factors)for wood structures,which, in turn, result in comparatively large seismic design forces, negating the inherent benefit of wood’s low weight.

Type:modular buildingCustomized Metal Shoring Steel Structure Project ICF Bracing System

Material:steel

Application:House Building

Function:Energy-saving

surface treatment:Hot dip galvanized

ICF bracing system:

U channel length :2700 mm,width:135 mm,both side height:60 mm,wall thickness: 3 mm,welded a plate with 16mm hole at bottom end

Support foot :Φ 38 mm,length1500 mm+Φ32mm,1500mm length,wall thickness :2 mm(total 3000mm length)

Triangle bracket: 40 mm x 40 mm,wall thickness :2 mm

Guardrail post:40*40* L:1100 mm * wall thickness 2 mm

Self-locking Pins:3pcs

Expansion bolts:3PCS

Reinforce bolts:2pcs